1 /* 2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <math.h> 12 13 #include "vpx_ports/mem.h" 14 #include "vpx_ports/system_state.h" 15 16 #include "vp9/encoder/vp9_aq_360.h" 17 #include "vp9/encoder/vp9_aq_variance.h" 18 19 #include "vp9/common/vp9_seg_common.h" 20 21 #include "vp9/encoder/vp9_ratectrl.h" 22 #include "vp9/encoder/vp9_rd.h" 23 #include "vp9/encoder/vp9_segmentation.h" 24 25 static const double rate_ratio[MAX_SEGMENTS] = { 1.0, 0.75, 0.6, 0.5, 26 0.4, 0.3, 0.25 }; 27 28 // Sets segment id 0 for the equatorial region, 1 for temperate region 29 // and 2 for the polar regions 30 unsigned int vp9_360aq_segment_id(int mi_row, int mi_rows) { 31 if (mi_row < mi_rows / 8 || mi_row > mi_rows - mi_rows / 8) 32 return 2; 33 else if (mi_row < mi_rows / 4 || mi_row > mi_rows - mi_rows / 4) 34 return 1; 35 else 36 return 0; 37 } 38 39 void vp9_360aq_frame_setup(VP9_COMP *cpi) { 40 VP9_COMMON *cm = &cpi->common; 41 struct segmentation *seg = &cm->seg; 42 int i; 43 44 if (frame_is_intra_only(cm) || cpi->force_update_segmentation || 45 cm->error_resilient_mode) { 46 vp9_enable_segmentation(seg); 47 vp9_clearall_segfeatures(seg); 48 49 seg->abs_delta = SEGMENT_DELTADATA; 50 51 vpx_clear_system_state(); 52 53 for (i = 0; i < MAX_SEGMENTS; ++i) { 54 int qindex_delta = 55 vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex, 56 rate_ratio[i], cm->bit_depth); 57 58 // We don't allow qindex 0 in a segment if the base value is not 0. 59 // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment 60 // Q delta is sometimes applied without going back around the rd loop. 61 // This could lead to an illegal combination of partition size and q. 62 if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) { 63 qindex_delta = -cm->base_qindex + 1; 64 } 65 66 // No need to enable SEG_LVL_ALT_Q for this segment. 67 if (rate_ratio[i] == 1.0) { 68 continue; 69 } 70 71 vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta); 72 vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q); 73 } 74 } 75 } 76
